Rubidium
37
Rb
Gruppe
1
Periode
5
Blokk
s
Protons
Electrons
Neutrons
37
37
48
Generelle eigenskapar
Atomnummer
37
Atommasse
85,4678
Mass Number
85
Kategori
Alkalimetall
Farge
Silver
Radioactive
Nei
From the Latin word rubidus, deepest red
Krystallstruktur
Body Centered Cubic
Historie
German chemists Robert Bunsen and Gustav Kirchhoff discovered rubidium in 1861 by the newly developed method of flame spectroscopy.
The separation of the metal was tried by Bunsen, but he never got samples with more than 18% of Rubidium.
The separation of the metal was only accomplished by George de Hevesy, through the hydrolysis of melted rubidium hydroxide.
The separation of the metal was tried by Bunsen, but he never got samples with more than 18% of Rubidium.
The separation of the metal was only accomplished by George de Hevesy, through the hydrolysis of melted rubidium hydroxide.
Elektron per energinivå
2, 8, 18, 8, 1
Elektronkonfigurasjon
[Kr] 5s1
Rubidium burns with a reddish-violet flame color
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
1,532 g/cm3
Smeltepunkt
312,46 K | 39,31 °C | 102,76 °F
Kokepunkt
961,15 K | 688 °C | 1270,4 °F
Smeltevarme
2,19 kJ/mol
Fordampingsvarme
72 kJ/mol
Spesifikk varmekapasitet
0,363 J/g·K
Abundance in Earth's crust
0,006%
Abundance in Universe
1×10-6%
CAS Number
7440-17-7
PubChem CID Number
5357696
Atom eigenskapar
Atomradius
248 pm
Kovalent radius
220 pm
Elektronegativitet
0,82 (Paulings skala)
Ioniseringspotensial
4,1771 eV
Molart volum
55,9 cm3/mol
Termisk konduktivitet
0,582 W/cm·K
Oksidasjonstrinn
-1, 1
Applications
Rubidium is used as a getter in vacuum tubes and as a photocell component.
Rubidium compounds are sometimes used in fireworks to give them a purple color.
Rubidium salts are used in glasses and ceramics.
Rubidium-87 is slightly radioactive and has been used extensively in dating rocks.
Rubidium compounds are sometimes used in fireworks to give them a purple color.
Rubidium salts are used in glasses and ceramics.
Rubidium-87 is slightly radioactive and has been used extensively in dating rocks.
Rubidium is not known to be toxic
Isotopes
Stable Isotopes
85RbUnstable Isotopes
71Rb, 72Rb, 73Rb, 74Rb, 75Rb, 76Rb, 77Rb, 78Rb, 79Rb, 80Rb, 81Rb, 82Rb, 83Rb, 84Rb, 86Rb, 87Rb, 88Rb, 89Rb, 90Rb, 91Rb, 92Rb, 93Rb, 94Rb, 95Rb, 96Rb, 97Rb, 98Rb, 99Rb, 100Rb, 101Rb, 102Rb